* Refactoring: move sink/source buffering into separate classes.

* Buffer the HashSink.  This speeds up hashing a bit because it
  prevents lots of calls to the hash update functions (e.g. nix-hash
  went from 9.3s to 8.7s of user time on the closure of my
  /var/run/current-system).

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libutil/hash.hh b/src/libutil/hash.hh
index cbdcf4c8d4..e0b6478cc4 100644
--- a/src/libutil/hash.hh
+++ b/src/libutil/hash.hh
@@ -91,7 +91,7 @@ string printHashType(HashType ht);
 
 union Ctx;
 
-class HashSink : public Sink
+class HashSink : public BufferedSink
 {
 private:
     HashType ht;
@@ -102,8 +102,9 @@ public:
     HashSink(HashType ht);
     HashSink(const HashSink & h);
     ~HashSink();
-    virtual void operator () (const unsigned char * data, unsigned int len);
+    void write(const unsigned char * data, size_t len);
     HashResult finish();
+    HashResult currentHash();
 };